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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba805b80e735af7bff7b86df8105e4d0375eee0303cad52c596a39f2f8f795b4' 
  AND token = 'g1tUvM/+u954IaY/ss5yf/JlouzZolN+EG3tl93vhIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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