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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1180b457524489947f7f58041b44d07523dc9a345090c876941a2a9f27561eaa' 
  AND token = '5SA07fqRXzgGFbOSeROlGMtMeZSXc5hygelhg4mD1ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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