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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79ce82d012bf2618b528e3d10d003590aa2cf0bedb3ab38844327658e358719' 
  AND token = 'DydoDbTHe9uQrg4JUfeCd+bY7khY36VEJKf3X2bEiF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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