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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4683f7acf169764646f7ff4a6e78335bb61dcbd23eb4302c2ce4ba1322ee20' 
  AND token = 'wM1aKcJ/fo9868wXBkYNPijStrqe2UV7nnx4Vc8761k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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