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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa7ce809dc4aba6b15bdc56b008b764e8368b71dfe06ddfb740897773b6fd67' 
  AND token = 'rg/rjWuE8yJsty2Xv81SNy/yPN1CST2rmrv7U6lJMtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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