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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1611cce64f175cfa9a766f349baab3b0ef311c38d3dab0963561cd1e410db7db' 
  AND token = '7Bz9smgeCm4t8BmjsHgQWa/1/5tci5GutJoUl3jCNLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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