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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1d126a5b772d2f170b4d7aaa52c5ae1db00ab08461a917bcf691964eb04d4a' 
  AND token = 'wP3hFUVU4yGNgTLip42I9vHJ0Y8zHB72zoDwViZDOMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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