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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa4a4502d1ec2cb17e2228363b748a86881ec18c02c4909a580f3c7bc8f7c2e' 
  AND token = '9Nzo6iqsDW/BFh8CsCAwdJJMhFZzTeP78g7R6+nuAgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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