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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbaac148a995df8d7d46c3438416b8d68558b477734b1c8a5ed07de7d46d305' 
  AND token = '3T+Ve5PFn3qRduuSJh5evCfB1/LUBuJsADtcam2nnpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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