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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b07c03ad21de23cae6b7e46052771139feb3393dd067dc9732f3a97f560d23' 
  AND token = 'dvCMmuYV7oTO3ldk0xe1j0LnouzLATe8xGiuVNxv4GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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