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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2808d2e15177977cf4cf1094666c6088783a1f66b09cd0a675afc2a551d4812e' 
  AND token = '3Rbei5NqAYhQiKWTz9S4Cf4VGUNq/40BhyaaYggcDz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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