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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef57bacb1492c9de3b97b3e7de43f4cccb1232d17c235627551bf364e9fcac27' 
  AND token = 'mDGrYn8z14Fnd636Niwqyt0SNqnmGQPnOfsEGXhsBb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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