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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9b56f3bc21caa89c49da7036d76f4023c692e30ee2fc70996974b24afca499' 
  AND token = 'CmIeYrtyYiM1i/2WY0w10P3VdjKkUMlRMlxuhzFEX2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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