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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56768bfcfa1cc5e1ab22fa1433de30c42dd5425b7688ef9dbcae35fbfd29eb1' 
  AND token = 'NNk330H1LKD5CPDL/iVUOVPLqwe94k6wG4jI7PtWj5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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