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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f439ae99cc06a7568ff13bf091c37583a53378c584e8d7c13b8b61c2cc6feb2' 
  AND token = '6A2N4fUq98Nd1fnRcDwHgAg24i4E3L5QJ+SkboadA/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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