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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dda024ffe3f2639624cbfa96a4548b9ac0822b5da4ab5f8bd62ba687e66a3e6' 
  AND token = '9cYj3WRusePqvPBl6GK7hgu1VlrSR3r5ycPKG9TYmXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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