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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a465d1ee4aa8a77d26fad0f39461e12a17d49e34c54a964709ea624fb54956b7' 
  AND token = 'AHVeG8m8ZuGdg6fi0DnK3MDyjCJQnWQQ3OfIbRvRHSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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