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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da2466cb04839a99cea4b1b8ca806c01836f8d4972c5624b465cd66825c94d6' 
  AND token = 'RTR+2/dqfH/QCO5+CzF65Y0k6eo1pSKLQMbuUTsCjtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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