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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd97fca6d383ea16a6c06724b3b1dacc244fab217bbd19e8ebf0ccd72e06b25b' 
  AND token = 'A3Kz5CxsXUGQEK89hM5F67sundI3vgAurmE3fwjg4r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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