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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ec9926f2747bdba492337ecae4c9e4af0af4e7e629894c8b5be5620d34a59f' 
  AND token = 'y/zJJKvq5Zbh8v51W5gZ7sE1nAt6iW6MDxuqKv2azn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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