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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e88e3193aaba88c4e5245dbf70462d619d6e42f983570978b334f6dfda9617' 
  AND token = 'HXgi0fxn/dIcP0abEGVw1EOaPRuUDSIuunWj9cfRKBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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