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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e635b565d50a0aa84ca2c81498cad2af5c63abdab384fe97c2f247d9f00bc22' 
  AND token = '/S4ooat4IkFvXmhALBg6vJaxM9bFtX2MJ2YU0gcGmBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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