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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76534a064541d4fc74a1cc28e63c1f2e466a045b5300a8815e78ae47f05a1b38' 
  AND token = '05bBqOlEyAFiTml5p/sdCNt5CbbVWdDus9Cz3b9O0uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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