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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c76f717fd535d4a0d2c9253f94ad1b927bb70ef521157748c926cfc716af3f' 
  AND token = 'inmaqM2KsgzOvBEoHRmhQLs13FeU7a0u+8J9RCfx4Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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