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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a657d7d0378322556de0c9aa8e68721f4aac56d21f67e34e47461852f543712f' 
  AND token = 'dyXdrZipc8fQlyrnSW1W8sqtBrVADurEb9T+j7EcykM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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