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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be841822a8a8eb078142029e4a470e6bda8ed609bc6c856d131aa1c1f5d206e9' 
  AND token = 'z4wPWlWN0CpJt5wGHYLNmQxT8QFvBaoA87RfBX4KaN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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