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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90af22f7aa25d5578ee2886030948eb2deb8c6db9cb12b3ed60b43d17e3074df' 
  AND token = '2GWNlmBSTkUW1f1Og3X7nEJzg/8Vxxtab1QHco0XC9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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