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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd831df8df4d643c1fa3926a9372b71a2ae749c7ba47982e4cbc5446d4d4c3465' 
  AND token = 'bE5hy44W5Ci7t//5/xu8QPCGZQcSveREOkZ5rlyOouo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}