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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c38c3e4adc3e94ebdda3bc40c5da1ee7ac60dfb074426ce0fa9f41c6d0bb9f' 
  AND token = 'c9zgAbvhi2G2akGK2iTGinqSJsphGXWEmCxrhL9rO0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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