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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b939f3213db7e1fba74ee5f9503a8c3e8c5c31389309142455b1356a8de4cd1b' 
  AND token = 'xPangtMWiK3fx/pH6lYHCahe1VEsroQMZt88U7v0DYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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