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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb030a59de4738eee8194e0e1fdc669068e70057ca462a27ebaab2efe933157' 
  AND token = 'NAegg/BS7PtcA5qrGAa300szH6dtFYcaUOWTMbtcOvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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