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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671859c6800702daac1ab4c63c726edeb35ea0618456a6a368e0a266b56cae55' 
  AND token = 'OBK5OnNdXZXxPWilb34+ZLvnQcgIB8Y49afmBhIYvqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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