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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacbb5e85ee7973107507bce0bfbe97600c1eb38513f050ab60a1be868a76214' 
  AND token = 'EktHDKVIWPwLwfPGwIHU4g3g1v+6bR2QWNFKD8rVRKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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