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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a00fc598a3ba51eaabc9794ca89c4c0cebd7f863dbbba0f0384d663911f4d2b' 
  AND token = 'EJVVjFW67gFJYMwDilXlFMZ6jSxgXCxEVEkcKvVJfco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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