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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff44fdcc88d72b4a2ac42d95741ca5e5764684acaa86ca4dddd354fd80a009d3' 
  AND token = 'iLSDMWcf2CGYGkRaQjJ6/b69smuE0ldKl5HAWBO/SJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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