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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2076d9855d3f2596324dfbb5a7ee39fd7badbacb6b92c22457f6580d18577cd' 
  AND token = 'CqNvOs1uvEA65++6zz8szZQyVjYOxV/7deCUDKod1yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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