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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d51f1962bbebbb5d7f7a55fde5201126795e8284bd9466cee1f5befe910d72' 
  AND token = 'tU8MdpvfTNczxgslEoAYp4gB2TvULMbk0SgWykBtyN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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