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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537f7dc3fff7b80f9e237f1984b94097f368cb26032ba50b63f888173082d9e1' 
  AND token = 'Zfd7/Wh4KH+ddx5G8d3lB5ul2a2hI9Hwou1tyd5XH14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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