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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aca45f21fab2c512241da9647b430427c1ec88dd9473c870b56545def84f3c9' 
  AND token = '39m41/4ELaw67CpWebsZl0s7SgBJk7h1Clt5bREZg5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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