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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0d1b09a1f283a28c488d103d25a1ed21de0e8e34bc06005c96c849c9501fcf' 
  AND token = 'bp0J6HZg7TiBW9BwwALASXxHiKRzV7jZ6YrP35hXyNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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