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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee987c176d76846aee98eb0078917b0c7ecdd0b99a91c6e31a861bba5d02908a' 
  AND token = 'YbEyA6DcUK8e8TEDgITG+OSJ/aOiM5uXxbZpQI9BmWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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