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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638ad6b3fcf05368b6462f34eca0c6580b93fbc1db92a32024a6f073f2b94f03' 
  AND token = 'SJ5PqqONWKU134Aew+46ravpQD9E6z6LW2ZWe/2f+gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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