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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252241120845f6e2137ce05c9d5d2b3457c9587d02e3c743b36fd3fb406b6d59' 
  AND token = 'BYC/XqCeFMNlLu/xTx9oo2uboMG5VYQhwGiTff3JQtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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