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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e4fb1ceecf1e3492a61f9ca4bb8df4bdee156ac9e0791e6730fb7c897ff76d' 
  AND token = 'MLxFXPhUYF4yIVjFkQWAxun+kwz89/aurb6Xzb2KOTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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