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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecb68bb93ab5fb1290d9c8379bcc56802ca8845585db0b6a8cb90ba6934df0a' 
  AND token = 'BeGUA92d0mBZm04V1+MCnBA82DXtc83UJ+2SMSUUcxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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