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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e75783f68a3cb6a5bdea8cbe8ddd2920d529de36394eca55a8e538ca637be8' 
  AND token = 'O1fltqMPa38xg7MHKkpm4+26vltoXcXetkwj5cni4Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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