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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1133ed456b2446191c7e3b4b73b44e6b88f4dc74625a049f18e71d4c7f57d8' 
  AND token = 'AVGIz4gYXcCyRIAqKbONbEKyObewQT36Az3cAZqw+8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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