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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c6d793ccbc9958a573e353d97eb93bbdf7f023ae6711f2aa1c6a2dfc82f319' 
  AND token = '5d1BkdUzUweN7Rn9mSEuXv9nTH12woWE1mVKvpHgowI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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