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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a91f01bddd61c3fc7fbba947325bdb5fa9a65ebcdef9ff0ba67dbf3f16073a' 
  AND token = 'r4Ww8zPLn24D1gEpX1GnPXPHwlE5hRuuOXuJXbysHxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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