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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a7ace74289e2903b783136ab18beee0187ce5dea571eaa6ac8bf6be83eeb4d' 
  AND token = 'EYp53fU236EBIy0quMJ7mB3L2zdOR8JcKzWjb2H27cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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