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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cea508cbd73ebec3f7bb3c1eb0555d61a02581b805ea08e158dbbd6b0fe734' 
  AND token = 'O1hg8WJbcAsgN+5ErflJve0AgckBWAzJbG0eFL6K0CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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