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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16bf821f8ee764ddeab44e4150fcb55a7e35f12451ea8666e1855e56438313ee' 
  AND token = 'YE3tQFYPKqznhYvf/r9Gmgv5h5s8ImacQVPLRp1GnHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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