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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f7ea9f931e13e8c584c404b5f6e0a2110b57f14243c4eab570e966c7a3d3a6' 
  AND token = '0WguiQ6QGAQyQ3Fxz8pruMiau1v76jSPTE+RuJ+Fnmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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