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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38406eaa19c0d92b8f6c4986a86848bb034948d1e373b26a4df9c618a65e75bf' 
  AND token = '7/vd/QVs2MjVi1Y4Jd0579ZOavZmMIB4eDc5uk/a9Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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