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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028d5912792c79abdf38ec7d3f92c71098a2d9d47ba6559c0718e812d943a623' 
  AND token = 'URYXkB7jp6/rKrTjG9tO7COE0vQBT0n2y5Sf27qUHjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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