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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5b197fba830767f52496887f29e116db9c3d8427a12200a123c057361fa389' 
  AND token = 'vos7WKN9rgIwndYpaT9cU16CeVE85Yc6+NlVRcZoQOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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