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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a99e7970f2dbd892a2d9dcbd8aecd52b0217f6af76bf99f1e5ac4bc1822bc56' 
  AND token = '5doshGHT2jm5nh9MQuko6DkFBIU9UVDGFyZip/pdipM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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