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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc30c832adfb0a8c3e7c68902a5a84ae6e82cc004c40fc4161f3cb822168b1e' 
  AND token = 'TTrVlNVM6WGYQZBCcgNCQwJ4EexcDRzqonkfnrEehr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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