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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dcefbd682273d7fa7e609399b9b1fd030f7b963bcef89be599c2b1a4d1d8a9' 
  AND token = 'JKQ4+b/bHtsVfBCnP8szuOmRWf2XcItYiJqC3TNovNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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