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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73767f493c18c58283e02cff468f793fd171a9eb3dde61458789e877fd21fc85' 
  AND token = 'D8NopTJwX51VRx6O1FNmkmgI2TaBbNdwtOlg0lck2vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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